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\bibitem{NA64CollaborationAndreev+MolinaBueno2021} NA64 Collaboration(Andreev, Y. M. et al), \& Molina Bueno, L. (2021). Search for pseudoscalar bosons decaying into e(+)e(-) pairs in the NA64 experiment at the CERN SPS. \textit{Phys. Rev. D}, \textit{104}(11), L111102--5pp.

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